Abstract
In hot conditions and with various parameters, it has been found several cracks and wear in the hot rolling process due to several factors including von mises stress and plastic strain which is affected by the size of the roller diameter and thickness of the specimen. Modeling and optimization using Response Surface Methodology (RSM) are chosen in this study to determine the optimum parameter design. The effect of roller diameter and thickness of specimens on equivalent stress von mises and plastic strains on the hot rolling process were studied using RSM. Central Composite Design (CCD) with two factors and three levels which are part of the RSM used to present mathematical models. Based on the results of RSM the optimum value obtained is on the roller diameter of 577.1389 mm and the thickness of the specimen 8.5786 mm.
Highlights
Metal rolling is a process to reduce the thickness or cross-sectional area of a metal or work piece, bypassing the workpiece on a rotating roller
A workpiece that passes through a rotating roller will experience surface stress and shear stress. Deformation of this process will cause the workpiece to increase in length, while the cross-sectional area or thickness will decrease
Higher friction causes the residual stress distribution in large rollers to be opposite to the residual stress distribution in the small rollers
Summary
Metal rolling is a process to reduce the thickness or cross-sectional area of a metal or work piece, bypassing the workpiece on a rotating roller. A workpiece that passes through a rotating roller will experience surface stress and shear stress Deformation of this process will cause the workpiece to increase in length, while the cross-sectional area or thickness will decrease. The smaller the diameter of the roller the less the thickness reduction, this is due to the tendency to undergo plastic deformation on the surface of the plate or sheet. This occurs because of high friction due to the larger contact area of the large roller diameter. Deformation in the hot rolling process can result in defects, such as center burst, surface cracking, alligatoring, and edge cracking
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